seth wilmarth



l UNITED Nsrarrns` i sETHwrLMARTn, or orniRLnsTowN, imssaonusnr l,Machine Foa nnawrNc-znonies,

Specicatioiiiof Letters Patent No. 26,315,` dated Noveinbe 29 855W x iTo all whom 'it 'may concern: 1

Be it known that I, SETH WILMARTH, of Charlestown, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulmachine, which I denominate Bolt-Drawing Forceps,` designed for use inthe repair of ships and other vessels to draw from their timbers orframes timbers by splitting them, and leaving anV irregular hole to beplugged. y

To overcome these objections is the object of my invention, and toenable others skilled in the art to make anduse my invention, I willproceed to describe its construction and operation;` and I do herebydeclare that the following is a full and j exact descriptionthereofreference being had to the accompanying drawings and to theletters of referenoe marked thereon. j

Figure 1 is a vertical and sectional elevation of the `machine on linesA B and C D of Fig. 2. Fig. 2 is a part plan of the same. Fig. 3 is atransverse section at the line E F of Fig. 1.

The part, a, is of a cylindrical form having arms or projections fromits sides for the support of the shafts or axles, b, it also forming acase or covering for the screw, c, and a rest or bearing for the nut d.In the part, a, is fitted a feather, e, to prevent the screw, c, fromturning with the nut, cl.` The screw, c, is made hollow to allow of thepeculiar arrangement of the jaws or dies, f, and also to permit the boltbeing drawn, to pass unobstructed throu h it, one end of said screw(internally) being in the form of the frustum of a cone, for thereception of the jaws or dies f.

The jaws or dies, f, are for holding the bolt, and are made `of steel,and tempered,

their external surfaces being fitted to the conical cavity at one end ofthe screw, c, the inner surfaces of the jaws are serrated `open whilebeing drawnxoutlbygthe; ipe,

, lows, viz., on its beingapplied to` a` bolt, the` j or have teeth `cutupon them which act upo the bolt to be drawn", abovethe serratedzp tionof the jaws are recesses` in which c placed a spring,g,thatcausesthejayvsto. j j j 6()` on each of thesejawsarelbails orandle y I; by which they may be drawn; outorforce f in upon the bolt.Thetransverse;sectionjof `allum l "$65.

these jaws may be rectangular orfother than that shown inthedrawings." jl A j j The ram, 71 is made al pipe` to l allow the bolt to be drawn `topassI througli` it,"fajnd\ having on its opposite sides projections byl`which to form thelconnection between nthel jaws and ram. Thespiral-spring,j11isffo` the purpose of retainingmhe several `ipa intheir proper places, landyalsoto clos thu jaws upon the bolt. y "111. fff y The washer, j, forms `the,connection be?.` tween the spring, z',andthe jaws, f. j` 3 l The purpose. of the handle, cistore`turnf i thescrew to its position` for Itaking hold of c 3 theybolt `without lossoftime, andislto be l removed when the cranks, 3m, areinnse, o of whichonly is shown fintliefdrawing) The axle, b', and itspinion, gearinglwitthe wheel, o, are to `be used for,multiplying` the power when required@`l, 3L

The pinions, n, on opposite `sides `of the` large wheel ornut,d, arefortheconvenience lI of two men working at the Sametime if re-1` f C lquired. U"

The operation of the machine is asfol;`

jaws, f, are drawn lback ,uponthe inclined surface upon whichtheyirest,.by` the pipe" or ram, h, being at the `sametime A force apartor opened bywthefspring,jg,ftheyare then ready to receive the `bolt. Themachin ybeing placed, the jaws aremadetogripfjthe: bolt by being `forced"or driven uponuitby the pipe or ram, k, which iis freeto lmovejth l jlength of the slots oropenings in thebailsj, j or handles marked, ;Z.Themaehine is now S ready for operation,jand` `power being ap?.l liplied to the hollow screw, throughfthe gear]-` C ing as shown inthedrawing `will cause the` ,c M jaws to grasp the bolt sofirmlyas toremove` it, if power is continuedtobe applied. f If l the bolt to bedrawn :is `longerthan can be 1.10151 drawn at one pull, thescrew may be`turned l back and a newhold taken, and the process j continued l j jAfter the bolt is fremovedthe pinions, ,c1/,gj`

are thrown out of gea-r, andthe screw runilloj back yto its position orVreceiving another substantially as, and for the purposes set bolt, bythe handle, 7c, when it is again ready forth.

for operation. y What I claim as my invention, and de- SETH WILMARTH' gf5 sire to secure by Letters Patent, is VVitnesSes:

The Combination, .and arrangement of the I. GILES, Y several partsherein specied and illustrated, WM. C. HUBBARD. Y

